Not liable to fail or vary. Permanent; of durable nature or quality.

Capable of lasting or continuing in existence; persistent, lasting; not transitory, permanent.

That dures; lasting, continuing.

Lasting, continuous; current, present.

Of a person: resolute, steadfast, constant (in a virtue). Obsolete.

Continuing without diminution or change; stable, constant, permanent. Of colours: permanent, unfading.

Constant, enduring.

That cannot be deleted, blotted out, or effaced; ineffaceable, permanent. of a mark, stamp, or character impressed upon anything; spec. of the…

Continuance for a long time in a settled and recognized position, status, etc.; long continued existence; an instance of this (now rare). Chiefly in o…

Enduring, permanent.

Lasting, continuing, durable.

That continues in existence, lasting. In later use chiefly in legal contexts: remaining in effect or force.

That continues in existence; lasting, abiding. Now rare.

(? Confused with stable, adj.) Permanent, stable. Obsolete.

Of a thing: Always kept up; permanent.

That has continued or existed for a long time; having had a specified role or identity for a long time. Originally and frequently attributive.

Permanent, lasting. Obsolete. rare.

(un-, prefix1 affix 1.)

Reliable, persistent, perennial; (of a position or appointment in South Asia) permanent. Now rare.

Originally and chiefly U.S. Resolute, uncompromising, unyielding, staunch. Of a quality or sentiment.

Present as a permanent or inherent quality of the brain or nervous system; (of the nervous system or its parts) having permanent or long-lasting…